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Even though this is midPoint 4.0, the numbers in the schema namespaces are still referring to version 3, e.g. This might seems strange and this decision was given a significant amount of consideration.  Version number was introduces to the namespaces in early days of midPoint when such a practice was quite common in the XML world. However, the current consensus of midPoint architects is that the schema versioning mechanism in the XML namespace is far from being ideal. A better versioning mechanism will be needed in the future. The preliminary design is to remove version number from the namespace entirely and use explicit schema versioning that could reflect semantic versioning principles. The preliminary plan is to address this in midPoint 5.0. Which would mean that the namespaces will need to change now and there will be another change in few years when midPoint 5.0 is released. We have decided that the current change from "common-3" to "common-4" would not bring any significant advantage. However, it would significantly complicate the upgrade from midPoint 3.x to midPoint 4.0. Therefore the decision was to keep the "common-3" namespaces. Even though it might look strange, we are doing a very pragmatic decision here that makes midPoint migration much easier for everybody.

Prism API changes

Prism API changes are described in Upgrade to 4.0 - Prism API migration notes.

Upgrade process

Flowing steps are an outline of an upgrade process: